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Finding the Fourth Proportional to 64.61, 89.28 and 46.16

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Solution

The fourth proportional to 64.61, 89.28 and 46.16 is: 63.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.61 : 89.28 = 46.16 : x
  2. Step 2: Convert to fraction form
    64.61/89.28 = 46.16/x
  3. Step 3: Cross multiply
    64.61x = 89.28 × 46.16
  4. Step 4: Simplify right side
    64.61x = 4,120.67
  5. Step 5: Solve for x
    x = 4,120.67/64.61
  6. Step 6: Final answer
    x = 63.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.